Concreto permeável com adição de TiO2 aplicado ao tratamento de esgoto sanitário

Abstract

The growth of the knowledge of the population has caused the consequences to the environment, with a generation and waste disposal in increasing quantity and complexity (industrial effluents, domestic sewage, solid residues, gaseous emissions), being like water reserves as more due. In this sense, the Advanced Oxidative Processes (POAs) have been published a good perspective to treat them. They are processes with hydroxyl (OH) radical potential, highly oxidizing species capable of mineralizing organic matter. The aim of this work was to evaluate the addition of photocatalytic titanium dioxide (TiO2) in permeable concrete at pH, dissolved oxygen, biochemical oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus, total ammonia, nitrate, fecal coliforms and total coliforms, total solids and turbidity for application without sanitary sewage treatment. A sunlight as the source of radiation. A photocatalytic flat reactor was built to pump 100 liters of raw sewage, with a flow rate of 100 L / min, on which it was placed as permeable concrete slabs, covering a total area of 1 m². As concentrations of TiO2 in the cement paste studied were 3, 6 and 10%. The results are deficient in BOD, COD, total phosphorus, total ammonia, nitrate, fecal coliforms, total coliforms, total solids and turbidity. An increase of pH and dissolved oxygen was observed in all tests performed. In the same way, a use of permeable concrete associated to 10% of TiO2 can add better efficiency in the treatment process of the sanitary sewage.